diff --git a/fuzz/fuzz.dict b/fuzz/fuzz.dict
index b33a23f6..c586acc4 100644
--- a/fuzz/fuzz.dict
+++ b/fuzz/fuzz.dict
@@ -16,4 +16,5 @@ compression_method_deflate64="\x09\x00"
 compression_method_bzip2="\x0E\x00"
 compression_method_zstd="]\x00"
 compression_method_aes="C\x00"
+compression_method_unsupported="\xFF\x00"
 "\xFF\xFF"
\ No newline at end of file